77039881 has 2 divisors, whose sum is σ = 77039882. Its totient is φ = 77039880.

The previous prime is 77039839. The next prime is 77039887. The reversal of 77039881 is 18893077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75968656 + 1071225 = 8716^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 77039881 - 2¹⁷ = 76908809 is a prime.

It is a super-2 number, since 2×77039881² = 11870286528988322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77039887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38519940 + 38519941.

It is an arithmetic number, because the mean of its divisors is an integer number (38519941).

Almost surely, 2^77039881 is an apocalyptic number.

It is an amenable number.

77039881 is a deficient number, since it is larger than the sum of its proper divisors (1).

77039881 is an equidigital number, since it uses as much as digits as its factorization.

77039881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 77039881 is about 8777.2365241003. The cubic root of 77039881 is about 425.5055225664.

The spelling of 77039881 in words is "seventy-seven million, thirty-nine thousand, eight hundred eighty-one".